// NOP
    }

    /**
     * Returns the pattern used to extract encoding information from content.
     * @return The encoding pattern.
     */
    protected abstract Pattern getEncodingPattern();

    /**
     * Returns the pattern used to identify tags in the content.
     * @return The tag pattern.
     */
    protected abstract Pattern getTagPattern();

    @Override

        metadataXpathMap.put(name, xpath);
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.codelibs.fess.crawler.extractor.impl.AbstractXmlExtractor#getEncodingPattern()
     */
    @Override
    protected Pattern getEncodingPattern() {
        return metaCharsetPattern;
    }

    /*
     * (non-Javadoc)
     *

        }
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.codelibs.fess.crawler.extractor.impl.AbstractXmlExtractor#getEncodingPattern()
     */
    @Override
    protected Pattern getEncodingPattern() {
        return metaCharsetPattern;
    }

    /*
     * (non-Javadoc)
     *